Nouns

(n)grinding, abrasion, attrition, detritionthe wearing down of rock particles by friction due to water or wind or ice
(n)attrition, contrition, contritenesssorrow for sin arising from fear of damnation
(n)attritiona wearing down to weaken or destroy“a war of attrition”
(n)attritionthe act of rubbing together; wearing something down by friction